JP2003166489A - Manufacturing method for multi-stage compression type rotary compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for a multi-stage compression type rotary compressor which reduces the cost by suppressing alteration of component parts as much as practicable and also sets the optimum excluded volume ratio easily while an enlargement of the compressor dimensions is precluded. <P>SOLUTION: According to this method for manufacturing the multi-stage compression type rotary compressor 10, the excluded volume ratio of a first rotary compressing element 32 to a second rotary compressing element 34 is set to the optimum value by changing the inside diameter D1 of the lower cylinder 40 without changing the thickness (height) of the lower cylinder 40. That is, the excluded volume of the second rotary compressing element is set between 40% and 75% of the excluded volume of the first rotary compressing element. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a multi-stage compression type rotary compressor in which a refrigerant gas compressed and discharged by a first rotary compression element is sucked into a second rotary compression element, compressed and discharged. It is about.

[0002]

2. Description of the Related Art In a conventional multi-stage compression type rotary compressor of this kind, refrigerant gas is sucked from a suction port of a first rotary compression element to a low pressure chamber side of a cylinder and compressed by an operation of rollers and vanes to an intermediate pressure. , Is discharged from the discharge port on the high pressure chamber side of the cylinder. Then, the refrigerant gas having the intermediate pressure is sucked into the low pressure chamber side of the cylinder from the suction port of the second rotary compression element, and the second stage compression is performed by the operation of the roller and the vane to become the high temperature and high pressure refrigerant gas. , Is discharged from the discharge port on the high pressure chamber side. Then, the refrigerant discharged from the compressor repeats the cycle of flowing into the radiator and radiating heat, then being throttled by the expansion valve, absorbed by the evaporator, and sucked into the first rotary compression element.

[0003]

In the multi-stage compression type rotary compressor according to the present invention, in particular, when a refrigerant having a large high-low pressure difference, for example, carbon dioxide (CO ₂ ) is used as the refrigerant, the discharge refrigerant pressure is as shown in FIG. High pressure (HP)
12 MPaG is reached by the second rotary compression element that becomes, and 8 MPaG (intermediate pressure M by the first rotary compression element that is at the lower stage side).
P) (the suction pressure LP of the first rotary compression element is 4M
PaG). As a result, the second step pressure (the suction pressure MP of the second rotary compression element and the discharge pressure H of the second rotary compression element)
The difference of P) is as large as 4 MPaG. In particular, since the discharge pressure MP of the first rotary compression element becomes low at low outside air temperature, the step pressure of the second stage (the suction pressure MP of the second rotary compression element and the discharge pressure of the second rotary compression element). There is a problem that the HP difference) further increases, the compression load of the second rotary compression element increases, and the durability and reliability decrease.

Therefore, conventionally, the thickness (height) of the cylinder of the first rotary compression element is set so that the displacement volume of the second rotary compression element becomes smaller than the displacement volume of the first rotary compression element.
By changing the dimensions, the excluded volume ratio is set so that the pressure difference in the second step is reduced.

However, in such a setting method, since the thickness (height) dimension of the first cylinder becomes large, the cylinder material of the first rotary compression element, the eccentric portion,
I had to change all parts such as rollers. In addition, since the thickness (height) of the rotary compression mechanism increases as the thickness (height) of the cylinder increases, the overall size of the multi-stage compression rotary compressor also increases, which reduces the size of the compressor. There was a problem that was difficult to achieve.

The present invention has been made in order to solve the problems of the prior art, and it is possible to suppress the change of parts as much as possible to reduce the cost, and to prevent the dimensional expansion of the compressor while optimally eliminating it. It is an object of the present invention to provide a method for manufacturing a multi-stage compression rotary compressor whose volume ratio can be easily set.

[0007]

That is, a method for manufacturing a multi-stage compression rotary compressor according to the present invention comprises an electric element and first and second rotary compression elements driven by the electric element in a closed container. The first and second rotary compression elements are fitted into the first and second eccentric portions formed on the rotary shafts of the first and second cylinders and the electric element, and are eccentric in each cylinder. A multi-stage compression rotary that is composed of rotating first and second rollers, sucks the refrigerant gas compressed by the first rotary compression element and discharged to the second rotary compression element, and compresses and discharges it. In manufacturing a compressor, the excluded volume ratio of the first and second rotary compression elements is set by changing the inner diameter of the cylinder without changing the thickness (height) dimension of the first cylinder. It is a thing.

Therefore, without changing all parts such as the cylinder material of the first rotary compression element, the roller, and the eccentric portion of the rotary shaft, for example, only the roller or the change between the roller and the eccentric portion is suppressed as much as possible. Therefore, it is possible to reduce the cost. In addition, since the overall size of the compressor can be prevented from increasing, the size can be reduced.

Further, in the manufacturing method of the multi-stage compression type rotary compressor of claim 2, in the above description, the excluded volume of the second rotary compression element is 40 times the excluded volume of the first rotary compression element.
% And 75% or less.

As a result, the excluded volume of the second rotary compression element is 40% or more of the excluded volume of the first rotary compression element 75.
When it is set to be not more than%, the excluded volume ratio of the first and second rotary compression elements becomes optimum.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view of an internal intermediate pressure type multi-stage (two-stage) compression rotary compressor 10 having first and second rotary compression elements 32 and 34 as an embodiment of the multi-stage compression rotary compressor of the present invention. 2 is a front view of the multi-stage compression rotary compressor 10, and FIG. 3 is a side view of the multi-stage compression rotary compressor 10.

In each drawing, 10 is an internal intermediate pressure type multi-stage compression rotary compressor using carbon dioxide as a refrigerant,
The multi-stage compression rotary compressor 10 includes a cylindrical hermetic container 12 made of a steel plate, an electric element 14 arranged and housed above the inner space of the hermetic container 12, and an electric element 14 arranged below the electric element 14. The rotary compression mechanism section 18 is composed of a first rotary compression element 32 (first stage) and a second rotary compression element 34 (second stage) driven by a rotary shaft 16 of 14. The closed container 12 has a bottom as an oil reservoir, and includes a container body 12A that houses the rotary compression mechanism portion 18 of the electric element 14, and a substantially bowl-shaped end cap (lid) 12B that closes the upper opening of the container body 12A. A circular mounting hole 12D is formed in the center of the upper surface of the end cap 12B, and a terminal (wiring is omitted) 20 for supplying electric power to the electric element 14 is mounted in the mounting hole 12D. Has been.

The electric element 14 has a stator 22 mounted in an annular shape along the inner peripheral surface of the upper space of the closed container 12.
And a rotor 24 inserted and installed inside the stator 22 with a slight gap. The rotor 24 is fixed to the rotating shaft 16 that extends vertically through the center.

The stator 22 includes a laminated body 26 in which donut-shaped electromagnetic steel plates are laminated, and a stator coil 2 wound around the teeth of the laminated body 26 by a direct winding (concentrated winding) method.
Have eight. The rotor 24 is also formed of a laminated body 30 of electromagnetic steel plates, like the stator 22.
It is formed by inserting a permanent magnet MG therein.

An intermediate partition plate 36 is sandwiched between the first rotary compression element 32 and the second rotary compression element 34. That is, the first rotary compression element 32 and the second rotary compression element 34 include an intermediate partition plate 36, an upper cylinder 38 and a lower cylinder 40 arranged above and below the intermediate partition plate 36, and the upper and lower cylinders 38, Upper and lower rollers 46 and 48 which are eccentrically rotated by upper and lower eccentric portions 42 and 44 provided on the rotary shaft 16 with a phase difference of 180 degrees in 40, and the upper and lower rollers 46,
The vanes 50 and 52 that abut the valve 48 to partition the insides of the upper and lower cylinders 38 and 40 into the low pressure chamber side and the high pressure chamber side, respectively, and the upper opening surface of the upper cylinder 38 and the lower opening surface of the lower cylinder 40 are closed. The upper support member 54 and the lower support member 56 function as support members that also serve as bearings for the rotary shaft 16.

The upper and lower cylinders 38 and 40 constituting the second and first rotary compression elements 34 and 32, respectively, are made of a material having the same thickness dimension in the embodiment. When the inner diameters of the cylinders 38 and 40 formed by cutting are D2 and D1, respectively, when changing the excluded volume ratio of the first and second rotary compression elements 32 and 34, The excluded volume ratio is set by changing the inner diameter D1 of the lower cylinder 40 of the first rotary compression element 32.

Here, for example, when the excluded volume ratio is set by changing the thickness (height) dimension of the lower cylinder 40, the thickness of the material of the lower cylinder 40, the lower eccentric portion 44, and the lower roller 48. All (height) dimensions must be changed. That is, in this case, it is necessary to change at least the lower cylinder 40 and the lower roller 48 from the material and change the cutting process of the rotary shaft 16 for the lower eccentric portion 44. On the other hand, in the case of the present invention, at least the lower cylinder 40 is made of the same material, and only the inner diameter when cutting is required. Although it is necessary to change at least the outer diameter of the lower roller 48, if the inner diameter is the same, the lower eccentric portion 44 will not be changed. As described above, according to the present invention, at least the material of the lower cylinder 40 is left unchanged, and the cutting process and the outer diameter of the lower roller 48 are changed, or the outer and inner diameters of the lower roller 48 are changed and the lower eccentric portion 44 is changed.
It can be dealt with only by changing. As a result, it is possible to set the optimum excluded volume ratio of the first and second rotary compression elements 32, 34 while minimizing the change of parts. In the embodiment, the excluded volume of the second rotary compression element 34 is set to 40% or more and 75% or less of the excluded volume of the first rotary compression element 32.

On the other hand, the upper support member 54 and the lower support member 56 have upper and lower cylinders 3 through suction ports (not shown).
A suction passage 60 (the suction passage on the upper side is not shown) communicating with the insides of the reference numerals 8 and 40 is partially recessed, and the recess is closed by an upper cover 66 and a lower cover 68. Discharge muffling chambers 62 and 64 are provided.

The discharge muffling chamber 64 and the inside of the closed container 12 are communicated with each other by a communication passage that penetrates the upper and lower cylinders 38, 40 and the intermediate partition plate 36, and an intermediate projecting pipe 121 is provided at the upper end of the communication passage. It is installed upright and the first from the intermediate discharge pipe 121.
The intermediate-pressure refrigerant compressed by the rotary compression element 32 is discharged into the closed container 12.

An upper cover 66 which closes the upper opening of the discharge muffling chamber 62 which communicates with the inside of the upper cylinder 38 of the second rotary compression element 34 has the inside of the closed container 12 as the discharge muffling chamber 62 and the electric element 14 side. Divide into

In this case, the carbon dioxide (CO ₂ ) which is a natural refrigerant in consideration of flammability and toxicity is used as the refrigerant, and the oil as the lubricating oil is, for example, mineral oil ( Existing oils such as mineral oil), alkylbenzene oil, ether oil, ester oil, PAG (polyalkyl glycol) are used.

The suction passage 6 of the upper support member 54 and the lower support member 56 is provided on the side surface of the container body 12A of the closed container 12.
0 (upper side not shown), discharge muffling chamber 62, upper cover 6
The sleeves 141, 142, 143, and 1 at positions corresponding to the upper side of 6 (the position substantially corresponding to the lower end of the electric element 14).
44 are fixed by welding. The sleeves 141 and 142 are vertically adjacent to each other, and the sleeve 143 is substantially on the diagonal line of the sleeve 141. Also, the sleeve 144
Is at a position displaced from the sleeve 141 by approximately 90 degrees.

One end of a refrigerant introducing pipe 92 for introducing a refrigerant gas into the upper cylinder 38 is inserted and connected in the sleeve 141, and one end of the refrigerant introducing pipe 92 communicates with a suction passage (not shown) of the upper cylinder 38. To do. The refrigerant introducing pipe 92 passes above the closed container 12 and passes through the sleeve 144.
The other end is inserted and connected in the sleeve 144 and communicates with the closed container 12.

In the sleeve 142, the lower cylinder 4
One end of a refrigerant introduction pipe 94 for introducing the refrigerant gas to 0 is inserted and connected, and one end of this refrigerant introduction pipe 94 communicates with the suction passage 60 of the lower cylinder 40. The other end of the refrigerant introducing pipe 94 is connected to the lower end of the accumulator 146.
A refrigerant discharge pipe 96 is inserted and connected in the sleeve 143, and one end of the refrigerant introduction pipe 96 communicates with the discharge muffling chamber 62.

The accumulator 146 is a tank for separating the suction refrigerant into gas and liquid, and is the container body 1 of the closed container 12.
It is attached via a bracket 148 on the accumulator side to a bracket 147 on the closed container side welded and fixed to the upper side surface of 2A (FIG. 2).

The multi-stage compression rotary compressor 10 of this embodiment is used in the refrigerant circuit of the water heater 153 as shown in FIG. That is, the refrigerant discharge pipe 96 of the multi-stage compression rotary compressor 10 is the gas cooler 1 for heating water.
It is connected to the inlet of 54. The gas cooler 154 is provided in a hot water storage tank (not shown) of the hot water supply device 153. The pipe exiting the gas cooler 154 is an expansion valve 15 as a pressure reducing device.
6 to reach the inlet of the evaporator 157, and the outlet of the evaporator 157 is connected to the refrigerant introducing pipe 94. Further, the refrigerant introduction pipe 92
As shown in FIG. 4, a defrost pipe 158 that constitutes a defrosting circuit branches from a midway portion thereof and is connected to a refrigerant discharge pipe 96 that reaches an inlet of the gas cooler 154 via an electromagnetic valve 159 as a flow path control device. . The accumulator 146 is omitted in FIG.

The operation will be described below with the following configuration. In the heating operation, the solenoid valve 159 is closed. The electric element 14 via the terminal 20 and wiring (not shown)
When the stator coil 28 is energized, the electric element 14 is activated and the rotor 24 rotates. By this rotation, the upper and lower rollers 46, 48 are fitted into the upper and lower eccentric portions 42, 44 integrally provided with the rotating shaft 16, and the upper and lower rollers 46, 48 eccentrically rotate in the upper and lower cylinders 38, 40.

As a result, the low-pressure refrigerant sucked into the low-pressure chamber side of the cylinder 40 from the suction port (not shown) through the refrigerant introduction pipe 94 and the suction passage 60 formed in the lower support member 56, the rollers 48 and the vanes. The intermediate discharge pipe 1 is compressed by the operation of 52 to become an intermediate pressure from the high pressure chamber side of the lower cylinder 40 through a discharge port (not shown) and a discharge muffling chamber 64 formed in the lower support member 56 through a communication passage (not shown).
21 is discharged into the closed container 12. by this,
The pressure inside the closed container 12 is an intermediate pressure.

The intermediate pressure refrigerant gas in the closed container 12 exits from the sleeve 144, passes through the refrigerant introduction pipe 92 and the suction passage (not shown) formed in the upper support member 54, and then from the suction port (not shown) to the upper cylinder. 38 is sucked into the low pressure chamber side. The sucked intermediate-pressure refrigerant gas is compressed in the second stage by the operation of the roller 46 and the vane 50 to become high-temperature high-pressure refrigerant gas, and is formed on the upper support member 54 from the high-pressure chamber side through a discharge port (not shown). The gas flows into the gas cooler 154 via the discharge silencer chamber 62 and the refrigerant discharge pipe 96. At this time, the refrigerant temperature is approximately +100.
The temperature rises to 0 ° C., and the high-temperature and high-pressure refrigerant gas radiates heat to heat the water in the hot water storage tank to generate hot water of about + 90 ° C.

On the other hand, the refrigerant itself is cooled in the gas cooler 154 and exits the gas cooler 154. Then, after being decompressed by the expansion valve 156, it enters the evaporator 157, evaporates, and is sucked into the first rotary compression element 32 from the refrigerant introduction pipe 94 through the accumulator 146 (not shown in FIG. 4). repeat.

In this way, the inner diameter D1 of the lower cylinder 40 is changed without changing the thickness (height) dimension of the lower cylinder 40, and the displacement volume of the second rotary compression element 34 is changed to the first volume. 40% or more of the excluded volume of the rotary compression element 32 7
By setting the ratio to 5% or less, the excluded volume ratio of the first and second rotary compression elements 32, 34 is set, so that it is possible to suppress changes in parts such as the cylinder material, the eccentric part, and the roller as much as possible. It is possible to reduce the compression load of the rotary compression element 34 of No. 2 and obtain the optimum excluded volume ratio in which the step pressure is suppressed as much as possible. Further, since the vertical dimension of the rotary compression mechanism portion 18 is not enlarged, the multi-stage compression rotary compressor 10 can be downsized.

Although the upper and lower cylinders 38 and 40 have the same thickness (height) size in the embodiment, the present invention is not limited to this, and those having different thickness (height) size from the first rotary compression element can be used. This includes the case where the excluded volume ratio is set by changing the inner diameter of the cylinder.

Although all the embodiments have described the multi-stage compression rotary compressor 10 in which the rotary shaft 16 is of a vertical type, the present invention can be applied to a multi-stage compression rotary compressor in which the rotary shaft is of a horizontal type. There is no end. Furthermore, the multi-stage compression rotary compressor is the first
Also, the two-stage compression rotary compressor having the second rotary compression element has been described, but the present invention is not limited to this, and the rotary compression element may be a multi-stage compression rotary compressor having three, four, or more rotary compression elements. It does not matter if you adapt.

Furthermore, although the multi-stage compression rotary compressor 10 is used in the refrigerant circuit of the hot water supply device 153 in the embodiment, the present invention is not limited to this, and the present invention is effective when used for heating the room.

[0035]

As described above in detail, according to the present invention, the closed container is provided with the electric element and the first and second rotary compression elements driven by the electric element. The rotary compression element is fitted into first and second eccentric portions formed on the rotary shafts of the first and second cylinders and the electric element, and is eccentrically rotated in each cylinder. In manufacturing a multi-stage compression rotary compressor which is composed of rollers and which sucks the refrigerant gas compressed by the first rotary compression element and discharged to the second rotary compression element, and compresses and discharges the same, The displacement volume ratio of the first and second rotary compression elements is set by changing the inner diameter of the cylinder without changing the thickness (height) dimension of the first cylinder. 1 rotary compression element cylinder material and La, without changing the entire parts of the eccentric portion and the like of the rotary shaft, for example the roller only, or suppressed as much as possible to such change of the roller and the eccentric portion only, it becomes possible to reduce the cost. In addition, since the overall size of the compressor can be prevented from increasing, the size can be reduced. Then, for example, the excluded volume of the second rotary compression element is 40% of the excluded volume of the first rotary compression element.
If it is set to 75% or more, the excluded volume ratio of the first and second rotary compression elements becomes optimum.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a multi-stage compression rotary compressor according to an embodiment of the present invention.

FIG. 2 is a front view of the rotary compressor of FIG.

3 is a side view of the rotary compressor of FIG. 1. FIG.

FIG. 4 is a refrigerant circuit diagram of a hot water supply device to which the rotary compressor of FIG. 1 is applied.

FIG. 5 is a diagram showing a relationship between outside air temperature and each pressure in a multi-stage compression rotary compressor.

[Explanation of symbols]

10 Multi-stage compression rotary compressor 12 airtight container 14 Electric elements 16 rotation axes 18 Rotary compression mechanism 32 First rotary compression element 34 Second rotary compression element 38, 40 Vertical cylinder 42,44 Vertical eccentric part 46, 48 upper and lower rollers 50,52 vanes 54 Upper support member 56 Lower support member

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F04C 23/02 F04C 23/02 E (72) Inventor Masaya Tadano 2-5 Keihanhondori, Moriguchi-shi, Osaka No. 5 In Sanyo Electric Co., Ltd. (72) Inventor Kazuya Sato 2-5-5 Keihan Hondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. In-house (72) Inventor Dai Matsuura 2, Keihan-hondori, Moriguchi-shi, Osaka 5-5 Sanyo Electric Co., Ltd. (72) Inventor Takayasu Saito 2-5-5 Keihan Hondori, Moriguchi City, Osaka Prefecture Sanyo Electric Co., Ltd. F-term (reference) 3H029 AA05 AA09 AA13 AB03 BB31 BB41 BB43 BB51 CC03

Claims (2)

[Claims] 1. A hermetic container includes an electric element and first and second rotary compression elements driven by the electric element, wherein the first and second rotary compression elements are the first and second rotary compression elements. And first and second eccentric portions formed on the rotary shaft of the electric element to be fitted to the first and second eccentric portions, and eccentrically rotated in the respective cylinders. Is a method for manufacturing a multi-stage compression rotary compressor in which the refrigerant gas compressed by the rotary compression element and discharged is sucked into the second rotary compression element, compressed, and discharged, wherein the thickness of the first cylinder is A method for manufacturing a multi-stage compression rotary compressor, characterized in that the excluded volume ratio of the first and second rotary compression elements is set by changing the inner diameter of the cylinder without changing the dimensions. 2. The excluded volume of the second rotary compression element is
40% or more and 75% or more of the excluded volume of the first rotary compression element
The method for manufacturing a multi-stage compression rotary compressor according to claim 1, wherein the following setting is made.